I provide both front-end and back-end web development in the following languages:
HTML, or HyperText Markup Language, is not truly code. HTML is the primary language that websites are written in. HTML puts the content on the page and orders it.
CSS, or Cascading Style Sheets, is the styling language of the web. CSS provides control over things like space between objects, fonts and sizes of type, color, shape, and much more. You might say that CSS is the primary design language of web design.
PHP is a back-end only web programming language. It runs only on the servers that host websites, and the code is not visible to site visitors. It can do very powerful things like database control, searching, and secure eCommerce transactions. Content management systems such as WordPress run on PHP.
I am also a BootStrap and WordPress engineer, and most of my projects are built in WordPress.